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Native plants · Oregon

Native plants of Gilliam County

132 plant species are recorded as native to Oregon in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in Gilliam County by USDA PLANTS. 102 of them have growing records you can filter by light, moisture, height and estimated cold hardiness. 1 more species is listed as both native and introduced and kept in a separate section.

County summary · USDA PLANTS and Kew WCVP

Gilliam County, Oregon

Native species
132 Typical Oregon county: 432 (median of 36 counties)
Garden-ready natives
102 Typical Oregon county: 311
Share by type (all 132 native species)
Percent of the 132 native species in each growth type
Tree 8% (11)
Shrub 11% (14)
Wildflower (forb) 64% (85)
Grass or grass-like 14% (18)
Vine 3% (4)

Wildflowers make up the largest share of the native list (64%), followed by grasses and grass-like plants (14%).

Recorded native ranges can include long-established populations that spread from gardens; check your state’s native plant society list for local guidance. How native status is decided.

ZIP codes mainly in this county fall in USDA hardiness zones 7a to 7b (2023 map).

The native plant list

Cold hardiness is estimated from each plant’s PLANTS minimum temperature. How we estimate it.

Garden-ready natives 102

Native species with PLANTS growing records (height, light, moisture, minimum temperature). “—” means PLANTS has no value.

Garden-ready native plants of Gilliam County, Oregon
PlantType HeightLight Water useHardy to
alpine leafybract aster Symphyotrichum foliaceum Wildflower (forb) 2 ft Sun Medium Zone 3b
American licorice Glycyrrhiza lepidota Wildflower (forb) 4 ft Sun–part shade High Zone 3b
American vetch Vicia americana Vine 1.3 ft Sun Low Zone 3b
antelope bitterbrush Purshia tridentata Shrub 6 ft Sun–part shade Low Zone 3b
arrowleaf balsamroot Balsamorhiza sagittata Wildflower (forb) 2 ft Sun–part shade Medium Zone 3b
ballhead waterleaf Hydrophyllum capitatum Wildflower (forb) 1 ft Shade-tolerant High Zone 4b
basalt milkvetch Astragalus filipes Wildflower (forb) 2 ft Sun Low Zone 5a
big sagebrush Artemisia tridentata Tree 4 ft Sun Medium Zone 3a
bigseed biscuitroot Lomatium macrocarpum Wildflower (forb) 6 in Sun Low Zone 4b
blanketflower Gaillardia aristata Wildflower (forb) 2 ft Sun Medium Zone 4a
Blue Mountain buckwheat Eriogonum strictum Wildflower (forb) 2.2 ft Sun Low Zone 5a
bluebunch wheatgrass Pseudoroegneria spicata Grass or grass-like 3 ft Sun Low Zone 3b
broadleaf cattail Typha latifolia Wildflower (forb) 5 ft Sun–part shade High Zone 3b
broom snakeweed Gutierrezia sarothrae Shrub 1.5 ft Sun Medium Zone 3b
Canadian horseweed Conyza canadensis Wildflower (forb) 5 ft Sun Medium Zone 12b
Canby's biscuitroot Lomatium canbyi Wildflower (forb) 10 in Sun Low Zone 4b
Carey's balsamroot Balsamorhiza careyana Wildflower (forb) 2.5 ft Sun–part shade Low Zone 6a
chamisso sedge Carex pachystachya Grass or grass-like 3.5 ft Shade-tolerant Medium Zone 3b
chokecherry Prunus virginiana Tree 25 ft Sun Medium Zone 3a
cous biscuitroot Lomatium cous Wildflower (forb) 10 in Sun Low Zone 4b
creeping barberry Mahonia repens Shrub 2 ft Shade-tolerant Medium Zone 5a
curvepod milkvetch Astragalus curvicarpus Wildflower (forb) 5 in Sun Low Zone 5a
curvepod yellowcress Rorippa curvisiliqua Wildflower (forb) 1 ft Shade-tolerant High Zone 12b
darkthroat shootingstar Dodecatheon pulchellum Wildflower (forb) 2 ft Sun–part shade Medium Zone 4a
desert yellow fleabane Erigeron linearis Wildflower (forb) 1 ft Sun Low Zone 5a
Douglas' dustymaiden Chaenactis douglasii Wildflower (forb) 1.6 ft Sun–part shade Low Zone 3b
Douglas' grasswidow Olsynium douglasii Wildflower (forb) 1 ft Sun Medium Zone 5a
Douglas' onion Allium douglasii Wildflower (forb) 11 in Sun Medium Zone 4b
false indigo bush Amorpha fruticosa Shrub 15 ft Sun Low Zone 3b
fernleaf biscuitroot Lomatium dissectum Wildflower (forb) 15 ft Sun–part shade Low Zone 8a
foothill deathcamas Zigadenus paniculatus Wildflower (forb) 1.6 ft Sun Medium Zone 4a
freckled milkvetch Astragalus lentiginosus Shrub 1.4 ft Sun Low Zone 4b
Gairdner's beardtongue Penstemon gairdneri Wildflower (forb) 1 ft Sun Low Zone 4b
golden currant Ribes aureum Shrub 10 ft Sun–part shade Low Zone 3b
golden spiderflower Cleome platycarpa Wildflower (forb) 2 ft Sun Medium Zone 12b
golden tickseed Coreopsis tinctoria Wildflower (forb) 3 ft Sun–part shade High Zone 12b
gray alder Alnus incana Tree 25 ft Sun–part shade High Zone 4a
Idaho fescue Festuca idahoensis Grass or grass-like 2 ft Sun–part shade Medium Zone 3b
Indian ricegrass Achnatherum hymenoides Grass or grass-like 2 ft Sun Low Zone 3a
largeflower hawksbeard Crepis occidentalis Wildflower (forb) 11 in Sun Low Zone 5a
largeflower triteleia Triteleia grandiflora Wildflower (forb) 2 ft Sun–part shade Medium Zone 4a
Leiberg's bluegrass Poa leibergii Grass or grass-like 1.5 ft Sun Medium Zone 5a
Lewis' mock orange Philadelphus lewisii Shrub 12 ft Sun Low Zone 8a
longleaf phlox Phlox longifolia Wildflower (forb) 1.2 ft Sun–part shade Low Zone 6a
low pussytoes Antennaria dimorpha Wildflower (forb) 4 in Sun–part shade Low Zone 3b
MacKenzie's willow Salix prolixa Tree 45 ft Sun Low Zone 2a
miner's lettuce Claytonia perfoliata Wildflower (forb) 1 ft Shade-tolerant Medium Zone 12b
Munro's globemallow Sphaeralcea munroana Wildflower (forb) 2.5 ft Sun Low Zone 4b
Nebraska sedge Carex nebrascensis Grass or grass-like 3 ft Sun High Zone 3b
needle and thread Hesperostipa comata Grass or grass-like 3 ft Sun Low Zone 3b
nineleaf biscuitroot Lomatium triternatum Wildflower (forb) 2.2 ft Sun–part shade Medium Zone 4a
Nuttall's povertyweed Monolepis nuttalliana Wildflower (forb) 10 in Sun Medium Zone 12a
pale evening primrose Oenothera pallida Wildflower (forb) 2 ft Sun Low Zone 3b
panicled bulrush Scirpus microcarpus Grass or grass-like 5.5 ft Sun Medium Zone 3b
peachleaf willow Salix amygdaloides Tree 60 ft Sun High Zone 4a
redosier dogwood Cornus sericea Tree 12 ft Sun High Zone 3b
reed canarygrass Phalaris arundinacea Grass or grass-like 5 ft Sun High Zone 3b
rock buckwheat Eriogonum sphaerocephalum Shrub 1 ft Sun Low Zone 5a
roundleaf alumroot Heuchera cylindrica Wildflower (forb) 6 ft Sun–part shade Low Zone 6a
royal penstemon Penstemon speciosus Wildflower (forb) 2.5 ft Sun Low Zone 4a
rubber rabbitbrush Ericameria nauseosa Shrub 4 ft Sun Medium Zone 3b
sagebrush buttercup Ranunculus glaberrimus Wildflower (forb) 6 in Sun High Zone 3a
sagebrush mariposa lily Calochortus macrocarpus Wildflower (forb) 1.8 ft Sun Low Zone 5a
Sandberg bluegrass Poa secunda Grass or grass-like 1.4 ft Sun–part shade Low Zone 3b
sanddune wallflower Erysimum capitatum Wildflower (forb) 2.5 ft Sun Medium Zone 4b
Saskatoon serviceberry Amelanchier alnifolia Tree 15 ft Sun–part shade Medium Zone 1a
scabland sagebrush Artemisia rigida Shrub 2 ft Sun Low Zone 3a
serrate balsamroot Balsamorhiza serrata Wildflower (forb) 1 ft Sun Low Zone 4b
sharpleaf penstemon Penstemon acuminatus Wildflower (forb) 2 ft Sun Low Zone 4a
showy milkweed Asclepias speciosa Wildflower (forb) 6 ft Sun Medium Zone 4a
silky lupine Lupinus sericeus Wildflower (forb) 6 ft Sun Low Zone 4b
silverleaf phacelia Phacelia hastata Wildflower (forb) 2 ft Sun–part shade Medium Zone 3b
slender cinquefoil Potentilla gracilis Wildflower (forb) 2.4 ft Sun Low Zone 3a
small camas Camassia quamash Wildflower (forb) 2.3 ft Shade-tolerant High Zone 4b
smallwing sedge Carex microptera Grass or grass-like 2 ft Sun High Zone 4a
smooth sumac Rhus glabra Tree 12 ft Sun Low Zone 4a
snow buckwheat Eriogonum niveum Wildflower (forb) 1.5 ft Sun–part shade Low Zone 5a
spineless horsebrush Tetradymia canescens Shrub 4 ft Sun Low Zone 9a
squirreltail Elymus elymoides Grass or grass-like 1.5 ft Sun Low Zone 3a
sticky cinquefoil Potentilla glandulosa Wildflower (forb) 1.5 ft Sun–part shade Low Zone 4a
sticky purple geranium Geranium viscosissimum Wildflower (forb) 3 ft Shade-tolerant Low Zone 6a
streambank wild hollyhock Iliamna rivularis Wildflower (forb) 6 ft Sun–part shade Medium Zone 4a
tapertip onion Allium acuminatum Wildflower (forb) 1 ft Sun Low Zone 4b
tarweed fiddleneck Amsinckia lycopsoides Wildflower (forb) 3 ft Sun Low Zone 4b
thickspike wheatgrass Elymus lanceolatus Grass or grass-like 2.3 ft Sun Low Zone 3b
threadleaf fleabane Erigeron filifolius Wildflower (forb) 1 ft Sun Low Zone 6a
Tolmie's onion Allium tolmiei Wildflower (forb) 1 ft Sun Medium Zone 4a
water birch Betula occidentalis Tree 25 ft Sun–part shade High Zone 1a
wax currant Ribes cereum Shrub 3 ft Sun Low Zone 5a
western juniper Juniperus occidentalis Tree 33 ft Sun Low Zone 4a
western stoneseed Lithospermum ruderale Wildflower (forb) 1.5 ft Sun Low Zone 4b
western white clematis Clematis ligusticifolia Vine 1 ft Sun–part shade Medium Zone 3b
white alder Alnus rhombifolia Tree 65 ft Shade-tolerant High Zone 5a
white sagebrush Artemisia ludoviciana Wildflower (forb) 3 ft Sun Low Zone 4a
Woods' rose Rosa woodsii Shrub 3 ft Sun–part shade Medium Zone 3a
woolly groundsel Packera cana Wildflower (forb) 1.5 ft Sun Low Zone 3a
woolly plantain Plantago patagonica Wildflower (forb) 6 in Sun Low Zone 12b
woollypod milkvetch Astragalus purshii Wildflower (forb) 7 in Sun Low Zone 4a
yellow fritillary Fritillaria pudica Wildflower (forb) 1 ft Sun–part shade Medium Zone 12a
yellow rabbitbrush Chrysothamnus viscidiflorus Shrub 3 ft Sun Low Zone 5a
yellow spiderflower Cleome lutea Wildflower (forb) 2.7 ft Sun Low Zone 12a
yellow wildrye Leymus flavescens Grass or grass-like 3 ft Sun Medium Zone 5b

Other native species recorded here 30

PLANTS has no growing records for these, so light, moisture, height and zone filters cannot include them. Many are wild species seldom sold by nurseries.

  • bastard toadflax Comandra umbellata
  • bluntleaf yellowcress Rorippa curvipes
  • brook cinquefoil Potentilla rivalis
  • carelessweed Cyclachaena xanthiifolia
  • chairmaker's bulrush Schoenoplectus americanus
  • clustered broomrape Orobanche fasciculata
  • cutleaf nightshade Solanum triflorum
  • Douglas' knotweed Polygonum douglasii
  • fineleaf hymenopappus Hymenopappus filifolius
  • flatspine bur ragweed Ambrosia acanthicarpa
  • giant red Indian paintbrush Castilleja miniata
  • hoary tansyaster Machaeranthera canescens
  • mat sandbur Cenchrus longispinus
  • neckweed Veronica peregrina
  • Pennsylvania pellitory Parietaria pensylvanica
  • povertyweed Iva axillaris
  • ribseed sandmat Chamaesyce glyptosperma
  • shaggy fleabane Erigeron pumilus
  • sleepy silene Silene antirrhina
  • slender phlox Microsteris gracilis
  • tarragon Artemisia dracunculus
  • veiny dock Rumex venosus
  • warty spurge Euphorbia spathulata
  • wavyleaf thistle Cirsium undulatum
  • western poison ivy Toxicodendron rydbergii
  • western tansymustard Descurainia pinnata
  • whitestem blazingstar Mentzelia albicaulis
  • witchgrass Panicum capillare
  • woodbine Parthenocissus vitacea
  • woolly sedge Carex pellita
Also listed as native and introduced here 1

PLANTS labels these species both native and introduced in this state: some forms are native and others were brought in from elsewhere. Most gardeners should choose plants from the main list.

Compared with Oregon

The typical county is the median of the 36 Oregon counties with PLANTS county records; the statewide figure counts every species native anywhere in the state. More species is not better or worse: counties differ in size, habitat and how thoroughly they have been surveyed.

Native species counts, Gilliam County and Oregon
MeasureGilliam CountyTypical countyStatewide
Native species 132 432 1,058
Garden-ready natives 102 311 683
Tree 11 — 87
Shrub 14 — 115
Wildflower (forb) 85 — 567
Grass or grass-like 18 — 232
Vine 4 — 18
Fern 0 — 39

Neighboring counties

Counties that share a ZIP code with Gilliam County.

Look up another ZIP

Matches your ZIP to the county it mostly lies in, then lists the plants recorded as native to your state (Kew’s World Checklist and USDA PLANTS) and recorded in that county by USDA PLANTS.

Source & data date

Source
USDA NRCS PLANTS Database: county distribution records, native status and plant characteristics. CC0 (public domain dedication, per the data.gov catalog record).
Kew’s World Checklist of Vascular Plants (WCVP): native or introduced status by state. CC BY 3.0.
USGS US-RIIS (ver. 2.0): species listed as introduced are excluded. CC0.
Citation
USDA, NRCS. 2026. The PLANTS Database (https://plants.usda.gov, 11/04/2026). National Plant Data Team, Greensboro, NC USA.
Govaerts R. (ed.) (2026). WCVP: World Checklist of Vascular Plants. Facilitated by the Royal Botanic Gardens, Kew. Data file dated 2026-06-04, http://sftp.kew.org/pub/data-repositories/WCVP/ (retrieved 2026-11-04). Paper: Govaerts R. et al. (2021) The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. Scientific Data 8, 215.
Data date
Retrieved from PLANTS on November 4, 2026; WCVP data file dated June 4, 2026.
Zones
USDA Plant Hardiness Zone Map (2023) ZIP table: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 3, 2026. Plant zones on this site are our estimate, not the official map.
Scope
Gilliam County (county FIPS 41021), Oregon. 132 native species from PLANTS county distribution records; garden-ready = species with a PLANTS characteristics record.
Method
A species is listed when it is recorded as native to the state in Kew’s World Checklist of Vascular Plants and USDA PLANTS, and recorded in the county by USDA PLANTS. Species PLANTS labels both native and introduced are listed separately. Full method · All sources

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